feat(smart-app): implement complete mobile app MVP

- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image

smart-app-city/frontend/node_modules/react-native/Libraries/YellowBox/YellowBoxDeprecated.js

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+'use strict';
+
+import type {IgnorePattern} from '../LogBox/Data/LogBoxData';
+
+const LogBox = require('../LogBox/LogBox').default;
+const React = require('react');
+
+type Props = $ReadOnly<{||}>;
+
+let YellowBox;
+if (__DEV__) {
+  YellowBox = class extends React.Component<Props> {
+    static ignoreWarnings(patterns: $ReadOnlyArray<IgnorePattern>): void {
+      console.warn(
+        'YellowBox has been replaced with LogBox. Please call LogBox.ignoreLogs() instead.',
+      );
+
+      LogBox.ignoreLogs(patterns);
+    }
+
+    static install(): void {
+      console.warn(
+        'YellowBox has been replaced with LogBox. Please call LogBox.install() instead.',
+      );
+      LogBox.install();
+    }
+
+    static uninstall(): void {
+      console.warn(
+        'YellowBox has been replaced with LogBox. Please call LogBox.uninstall() instead.',
+      );
+      LogBox.uninstall();
+    }
+
+    render(): React.Node {
+      return null;
+    }
+  };
+} else {
+  YellowBox = class extends React.Component<Props> {
+    static ignoreWarnings(patterns: $ReadOnlyArray<IgnorePattern>): void {
+      // Do nothing.
+    }
+
+    static install(): void {
+      // Do nothing.
+    }
+
+    static uninstall(): void {
+      // Do nothing.
+    }
+
+    render(): React.Node {
+      return null;
+    }
+  };
+}
+
+// $FlowFixMe[method-unbinding]
+module.exports = (YellowBox: Class<React.Component<Props>> & {
+  ignoreWarnings($ReadOnlyArray<IgnorePattern>): void,
+  install(): void,
+  uninstall(): void,
+  ...
+});